Snapchat’s privacy page explains that private images are stored on someone’s phone — and on its own servers. “Forensically, even after they are deleted,” Snapchat says, those images can be retrieved. Whisper’s privacy page says the company owns the intellectual property, both images and text, that people post; Whisper reserves the right to sell that stuff to third parties. And Telegram, while seemingly less innocuous with its claims, nonetheless leaves out something you might want to know: someone can just take a screenshot or picture of that “private” conversation.